scholarly journals Design of a Broadband Parallel-Coupled Microstrip Filters without Spurious Resonances

2007 ◽  
Vol 2007 ◽  
pp. 1-5
Author(s):  
Maher M. Abd-Elrazzak
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Ground Plane ◽  
Published Data ◽  
Microstrip Filters ◽  
Coupled Lines ◽  
Perfect Matched Layer ◽  
Difference Time ◽  
Spurious Response ◽  
Suspended Substrate

A design of parallel-coupled microstrip bandpass filters without spurious resonance is presented. Two different techniques are used to eliminate this response at twice the passband frequency (2fo). The first one is based on usage of suspended substrate, while the second is carried out by shorting the parallel-coupled lines to the ground plane through two shorting walls. The numerical results show that a broadband filter can be obtained by the suppression of the spurious response. The finite difference time domain (FDTD) with the perfect matched layer (PML) is used in the present analysis. The obtained results are compared with the available published data and good agreements are found.

scholarly journals The Alternating Direction Implicit Body of Revolution Multiresolution Time Domain Method with Convolution Perfect Matched Layer

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Chen Yiwang ◽  
Ni Jiazheng ◽  
Liu Yawen ◽  
Dong Xiaohua ◽  
Zhang Pin
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Three Dimension ◽  
Body Of Revolution ◽  
Alternating Direction Implicit ◽  
Alternating Direction ◽  
Perfect Matched Layer ◽  
Difference Time

Overmuch memory and time of CPU have been taken by multiresolution time domain (MRTD) method in three-dimension issues. In order to solve this problem, the alternating direction implicit body of revolution multiresolution time domain (ADI-BOR-MRTD) scheme is presented. Firstly, based on body of revolution finite difference time domain (BOR-FDTD) method, equations of body of revolution multiresolution time domain (BOR-MRTD) method are implemented. Then alternating direction implicit (ADI) is introduced into BOR-MRTD method. Lastly, convolution perfect matched layer (CPML) is applied for ADI-BOR-MRTD method. Numerical results demonstrate that ADI-BOR-MRTD method saves more memory and time of CPU than FDTD and MRTD methods.

scholarly journals A Compact Wideband Stacked Antenna for the Tri-Band GPS Applications

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Maher M. Abd Elrazzak ◽  
M. F. Alsharekh
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Patch Antenna ◽  
Finite Difference Time Domain ◽  
Dielectric Materials ◽  
Scattering Parameters ◽  
High Permittivity ◽  
Perfect Matched Layer ◽  
Difference Time ◽  
Stacked Patch Antenna

A compact wideband stacked patch antenna is presented for the applications of GPS systems. This antenna covers the L1, L2, and L5 GPS bands of operating frequencies 1.575, 1.227, and 1.176 GHz, respectively. High permittivity dielectric materials are used to minimize the antenna dimensions. The obtained antenna is of dimensions  mm. To verify the design, the time dependence field distribution, the scattering parameters, and the radiation pattern are presented. The scattering parameters show that the antenna operates at the GPS frequencies with lower than  dB. The finite difference time domain (FDTM) with the perfect matched layer (PML) is used in the present analysis.

Improvement of the Stability of Convolutional Perfect Matched Layer Based on Finite Difference Time-domain Algorithm

2017 ◽  
Vol 46 (8) ◽  
pp. 826001
Author(s):  
谢国大 XIE Guo-da ◽  
黄志祥 HUANG Zhi-xiang ◽  
王丽华 WANG Li-hua ◽  
吴先良 WU Xian-liang
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Perfect Matched Layer ◽  
The Stability ◽  
Difference Time
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